Screen or separator.



TfL. & T. J. STURTEVANT.

SCREEN 0R SEPARATOR.

APPLICATION FILED NOV.17, 1910.

Patented Oct; 20, 1914.

4 SHEETSSHEET 1.

INVENTORS;

WIN 7 T. L. & T. J. STURTEVANT.

SCREEN 0R SEPARATOR.

APPLICATION FILED NOV.17,1910.

Patented 0ct.20, 1914.

4 SHEETS-SHEET 2.

4 A INVENTORY.-

zr a WITNESSES T. L. & T. J. STURTEVANT.

SCREEN 0R SEPARATOR.

APPLIGATION FILED NOV. 17, 1910.

Patented Oct. 20, 1914.

4 SHEETSSHEET 3.

, A VENTORr- WITNESS T. L. & T. J. STURTEVANT. SCREEN OR SEPARATOR.

APPLICATION FILED NOV. 17, 1910.

Patented Oct. 20, 1914.

4 SHEETS SHEET 4.

o 00 oo oo o e 0e 00 oo o o o o 0 Jul 0 o oo o m o 0 0'0 t o o o o o 3/ b O O Q a a Y 3;? INVENTORS: )JAZFQIMP M Affome u,

UNITED STATES PATENT OFFICE.

THOMAS LEGGETT STURTEVANT, OF QUINCY, AND THOMAS JOSEPH STURTEVANT, WELLESLEY, MASSACHUSETTS, ASSIGNORS TO STUBTEVANT MILL COMPANY, A

CORPORATION OF MAINE.

of which the following is a' specification, reference being had therein to the accompany-' ing drawings.

This invention relates to that class of vibrating screening or separatin machines in which the screens are jarred y percussive action, and the object of the present improvement is to render machines of this class more durable and more eflicient in operation than similar screening or separating machines heretofore constructed, as will hereinafter more fully appear.

In the accompanying drawings Figure 1 is a broken-out front elevation of a separator embodying the present invention, and Fig. 2 is a side view thereof. Fig. 3 is a sectional view ofthe improved separator, showing impact bars attached to the screen, and Fig. 4 is a sectional view similar to Fig. 3 but showing loose or' non-attached lmpact bars. Fig. 5 is a detail view showing the construction by which the impact bars are attached to the screen frame, and Fig. 6 illustrates one of the hammer bars in detail. Fig. 7 is a plan view, partly broken out, of the form of screen shown in Fig. 3, and Fig. 8 is a broken-out side or edge view of the same. Fig. 9 is a detail view to show the connections of one of the stretching bars with the screen frame. Fig. 10

1s a View, similar to Figs. 3 and 4, illustrat ing a modified form of screen.

The improved separator illustrated in the drawings comprises a suitable incllned screen box which may consist of side pieces or sides 12, a front casing part 13 and a removable rear casing part 14, the latter being preferably removably mounted in place, and the parts of said box or casing being rigldly secured together. The said screen box or casing is preferably pivotally attached or hinged at 15 at its lower part to foot bars 16, so that said box or casing may be adjusted to different angles of inclination. To this end the sides 12 of the casing are adjustably connected with the foot bars 16 by means of eye-bolts 17 attached at their I Specification of Letters Patent. Application filed November 1'}, 1910. Serial No. 592,858.

SCREEN OR SEPARATOB.

Patented Oct. 20, 1914.

lower ends to said at their screw-threaded upper ends with adjustable nuts 18 engaging brackets 19 attached to the sides of the box or casing, so that by screwing said nuts up or down on said eye-bolts, the separator and of carried thereby may be varied.

The inclined screen box or casing, constructed as above described, although adjustable to different angles, is-nor1nally fixed foot bars, and provided I the angle of inclination of the screen or screens or stationary, and supports one or more fiat screens, consisting of wire mesh or woven wire cloth which comprises transverse as well as longitudinal wires and which is secured to a sutiable frame or frames attached to or supported by the screen box or casing, the said screenor screens being percussively jarred by suitable impact means. From this it results that the fineness of the output may bevaried by varying the angle of inclination of the fiat wire mesh screen or screens, and this is effected by varying the angle of inclination of the screen box or casing, supporting said screen or screens, through. the

medium of the adjusting means above described.

Attached to the screen casing are suitable standards or supports 20 which are provided with bearing portions 21 in which are journaled shafts nected with a driving shaft 23 by suitable chain and sprocket gearing, as shown in Figs. 1 and 2. On the shafts 22 are mounted carriers 24 provided with rollers 25. Attached to the front 13 of the screen box or casing are brackets 26 in which are pivotally mounted hammers 27 arranged to be engaged and lifted-by the rollers 25 on the rotating carriers 24. Beneath the hammers 27 are located impact bars 28 which act on the screen or screens 29, the said impact bars being guided vertically in the brackets 26 through which they loosely pass, and said bars being preferably-secured at their lower ends to the frame of the screen 29.

The screen 29, when constructed as shown in Figs. 3, 7 and 8, preferably consists of metal side bars 30, end bars 31, and a central bar 32. The woven wire screen 33 is attached to the side bars 30 in any suitable manner, preferably by being clamped between two parts of each of said side bars, the latter being adjustably connected with the end bars 31 by means of bolts 34 pass- 22 which are operatively con- 7 ing' through slotted flanges on the said side bars. 'llheside bars of the frame are connected by tension, rods 35! passing through flanges on the said side bars, the end portions of said rods being threaded for the reception of, adjusting and set nuts 36.. From thisconstruction.ittwill be understood material being sifted is first fed. It will be. that the woven wire screen33 may be placed understood of course that other means than under any suitable desired tension by means the bathe bars 433 herein shown may be em- 10 of the adjusting nuts on the bars 35 and ployed for retarding the downward move- 75 which adjusting-nuts may be-locked in any 'ment of the material of an inclined'screen, desired position by the set nuts contiguous although said bailie bars provide a preferred thereto; construction for this purpose.

To'provide f'orthe attachment ofthe' iiil- In the operation of the improved separapact bars 28 to the screen frame the said' torthe rollers 25, mounted on the rotating 80 bars m. preferably constructed at their carriers-2 k, will lift thehammer bars 23, and lower ends with threaded shouldered studs as thesaid hammer bars are released from 37 for the reception of nuts 38- bywhich said rollers they falland strike the upper the impact bars maybe secured to-thecenends of the impact bars 28 which impart r l bar 32- imd the Side bars on the percussive jarring-- vibrating movements to screen frame; and in. thus attaching the said the screen 29. The said hammer bars 27. are impact bars to. the screen frame the wire preferably constructed so that they may be cloth screen 33: is, prefierably clamped bereversed when battered or worn. To this tween connectedparts of said cross bar and end the said bars, which are preferably 25 slde b r aS d nflfie n h drawing a squa-re in cross section, are provided near -mone particularly in detail= in- Fig 5.: their opposite ends with holes 4A so that 'Bheimprov d scparator ispreferablyprothey may be-pivotally mounted at either end vided at its-upper end with acoarse scalpinthe brackets 26, by- 'reversing said bars ingscreen 39 which first receives the mate end for end; or by turning said bars oven,

.30 rial fed totheseparator-i rom-the-feed boX- or upside down, bothfaces of each of the g5; 40. The said scal'ping screen will sift out opposite ends of the said bars may be utithecoarser part ofi'the material which will lized, thus presenting a new wearing portion be-discharged from-,said sereen onto a'plate orface when one wearing porti'on'or face 41 down which it will pass-tea suitable disbecomes badly battered or-worn i11=1188.

35 charge. opening at the bottom of the separat'orehe-fine'r material passing through the scalping screen 39 will fall upon areceivingplate 42 from which it will pass to the screen 29. It will be observed that the 4 fine-wire cloth or wire mesh screen 29 is arranged practically intheextended plane of the receiving plate 4%, so that the material slides from the said} receiving plate onto the said screen insuchamanner-as tohave 45 no falling impact thereon; and thus injury to the somewhat; fragile wire; cloth screen, and which might result from afalling impact; ofha'rd sharp material, will=be-avoided.

When material? which is beingsifted is 5 fed; to an inclined screen alarge portion of 'the sifting operation will be effected at the upper portion of the said screen, for the reason that as the material passes down the inclined screen its travel is so accelerated that when it reaches the lower portion of the screen it will be traveling sofast that the finer portion of the material can hardly pass through a fine mesh screen atall: To obviate this difficulty, and to render the entire screening surface more effective than it otherwise would be, the present invention comprises means or devices-for retarding thedownward passage of the material being sifted by'an inclined screen. To this end,

55 the'present invention preferably comprises transverse baffle bars 43 which will check the downward passage of the material and practically arrest the movement thereofat intervals, so that each section ofthe screen below' eachbaflie bar becomes as effective as the upper portion of thescreen to which the from the soalpingscreen- 34k onto the receiving plate 42, instead of discharging such material directlyonto'the wire cloth screen, muchwear of the wire cloth screen is avoided, for the reason that the material? will be fed to the wire cloth scncensimply by sliding thereon, instead of'f'a-llingon the screen withmore or less-impact, as would be the case if the material were discharged downward from the sealping screen; onto a fine wire cloth sifting screenbeneath it.

Instead of attaching the impact bars 28 to the screen frame, as horeinbeforc described, said bars may rest. loosely at their lower ends, on said frame, or on protecting. 1% plates with which the screen may be provided, asshown in- Fig; 4

Instead of providing the separator with onelargesiftingscreen, as 29, the sifting screen, considered: asa whole, may consist of several relatively narrow screens 45, as shown in Fig 10, so arranged that the ma terialto besifted may pass from one to another as it travels downwardi In this construct/ion of a sectional screen the different parts thereof may be so arranged! as. to check' the downward movement of the material by having the upper ends of the different screen sectionsiraiscd so as to be out of llnewiththe lower ends of the screen By discharging the entering materialing pockets at the an inclined,

sections just above, thus providing detaint1ons to" retard or check the downward movement of the material. This arrangement of screens serves a purpose similar to the function performed by the bafiie bars 43, andof course it will be understood that said baflie bars might be used with the sectional screens if desired. In thus forming the sifting screen in sections, or providing a sifting screen which consists of a plurality ofscreens which are relatively narrow, in the direction of travel of the material, it will not be necessary to provide means for stretching the screen clothing taut, as the said screen clothing can be permanently secured to the screen frames under a 'sufiicient tension for effective service. Asa matter of fact it may be desirable in some instances toattach the screen clothing to the sections or separate parts of the screen somewhat loosely. so as to permit said screen clothing to sag slightly, for the purpose of retarding the downward travel of the material to the screen; and when fthe material is thus retarded, by providing a succession of screen sections having sagging screen clothin other means for arresting the downward travel of the material, may be dispensed with.

Having thus described our invention we claim and desire to secure by Letters Patent:-

1. In a separator,- the combination with :n'ormally fixed or stationary box or casing and one or more flat screens inclosed therein and supported thereby, of

v is pivotally clination of foot bars with which the said box or casing connected at its lower end, and adjusting means for varying the angle of insaid box or casing on its pivotal connection with said :loot bars, said adjusting means comprising threaded eye bolts provided with adjusting nuts, and brackets engaged by said adjusting nuts.

2. In a separator, the combination With an inclined, normally fixed screen box or casmg, and one or more ,fiat.metallic screens supported thereby, of adjusting means for varying the angle of inclination of the said box or casing and of the said screen or screens, percussive means for jarring the said screen or screens, andtransverse bafiie bars on the upper surface or surfaces of said screen or. screens, and over which the. descending material passes, said bafliebars serving to check the'downward movementof the material. on said inclined screen or screens at intervals. I

3. In a separator, "the combination with an inclined, wire mesh screen, comprising longitudinal and transverse wires, and the entire lower ends of the secwill surface of which is disposed in' the same plane, of means for retarding'orchecking the downward movement of the material thereon, said means comprising baiile bars on the upper surface of said screen and arranged transverse to the downward move- 4."In a separator, the combination with an i scalping screen 5. In a separator, the 'combmation with an inclined casing provided at its upper end with a relatively short coarse or scalping screen, of a receiving plate of a length about equal to said screen and on which all of the material passing through said scalping screen will be re ceived, and an inclined metallic screen which is practically in the extended plane of said receiving plate and to which screen rial received on said plate will slide or be discharged.

6. In a separator, a pivoted hammer bar' which is square, or practlcally so, in cross section, so that oppositefaces of both ends thereof may be used for percussive action, said hammer being provided near its oppothe matescalping site ends with holes to receive the pivot, so I that said hammer bar may be reversed endwise for the purpose of bringing its opposite ends into hammer action.

7. A screen for use in separators comprising a frame consisting ofend'bars and side bars, the latter being slidably mounted on said end bars so that theymay be moved toward and from each other, woven wire screen clothing attached to said side bars, tension rods for stretching said screen clothing and ,varying the tension thereof, said tension rods having screw threaded opposite end portions provided with adjusting nuts by which the tension on the screen clothing may be varied and set nuts for securing said adjusting nuts in place.

In testimony whereof we aflix our signa"- tures, in presence of two witnesses.

THOMAS LEGGETT STURTIIWANT.

. THOMAS JOSEPH STURTEVANT- Witnesses: s

W. F. Ennis,

L. T. SruRrEvAN'r. 

